The negotiations round of the Gatt/WTO system have encouraged their participants to reduce their tariffs on the international trade. To satisfy internal lobbies without breaking those rounds' rules, lots of governments began to exert their protectionism by non-tariff barriers. One of the most polemicals cases, recently ocurred, was the imposition of steel import quotas by the US government. Because the US is the biggest importer of steel, it is expected that the impacts of their act will be very large. The objective of this work is just evaluate these impacts. For that reason, we use an Applied General Equilibrium Model, the GTAP. We run a simulation putting import quotas in the model, focusing in the Bush's act. The results show a benefit to the countries which are in the same trade blocs than USA.